For example,Vargas obviously did something bad to Nick and it's too late to undo it, but that's no reason to write him out, if that was the planned story arc.

It depends what the something bad was. I think there are bad things Vargas could have done to Nick which are redeemable, rape just isn't one of them particularly under those circumstances.

If he's just assaulted Nick in prison for ratting him out and giving him an extra three years prison time that probably is redeemable.Hell Rafe assaults someone about three times a year and he's still here.

Although if Days has taught me anything its to believe in the power of "Change" so maybe you can go from being in prison rapist to the next Bo Brady.

I'm just one of those people who don't care about fictional crimes that happened a long time ago, for the most part and who has no desire to see characters hold long term grudges, unless they take the form of soapy rivalries.